Thermal ring contraction of oxygenated pyrazines to imidazoles via diazoxepins
作者:Amanda J. O'Connell、Colin J. Peck、Peter G. Sammes
DOI:10.1039/c39830000399
日期:——
Deoxygenation of pyrazine endoperoxides with triphenylphosphine can result in ringcontraction to imidazoles, a process involving the heterocyclic analogues of arene oxides, these being in equilibrium with the corresponding 3,6,1-diazoxepins.